Apparatus and Method for Triggering Session Re-Negotiation Between Access Network and Access Terminal in a High Rate Packet Data System

1. A method for triggering re-negotiation of a session when an access terminal (AT) moves from one access network (source AN) to another access network (target AN) having different capability in high rate packet data system, the method comprising the steps of: (a) the AT sending a UATI Request message to the target AN when the AT recognizes that it has crossed a boundary; (b) the target AN acquiring the source AN address from the UATI and transmitting a session information record message to the source AN; (c) the source AN sending session information along with non-default protocol types that the AT supports; and (d) the target AN checking whether it can support protocol types more advanced from ones currently in use and initiating session re-negotiation if it can support the more advanced protocol types.

2. The method of claim 1 , wherein the non-default protocol types further comprise protocol subtypes and application subtypes.

3. A method for triggering re-negotiation of a session when an access terminal (AT) moves from one access network (source AN) to another access network (target AN) having different capability in high rate packet data system, the method comprising the steps of: (a) the AT sending UATI Request message to the target AN after the AT crossed a boundary; (b) the target AN acquiring the source AN address from the UATI and retrieving session information from the source AN; (c) the AT sending information related to supported non-default subtypes for a number of protocol types and supported application subtypes and other relevant capability information to the target AN after UATI Request; and (d) the target AN checking whether it can support protocols more enhanced than ones currently in use and initiating session re-negotiation if it can support the more enhanced protocols.

4. A method for triggering re-negotiation of a session when an access terminal (AT) moves from one access network (source AN) to another access network (target AN) having different capability in high rate packet data system, the method comprising the steps of: (a) the target AN broadcasting information related to minimum and maximum revisions that it supports in overhead information messages; (b) the AT checking the minimum and maximum revisions that the target AN supports and comparing that with its capabilities and also with the current session parameters; and (c) initiating session re-negotiation if the AT determines that session needs to be re-negotiated.

5. A method for triggering session re-negotiation in a source access network (AN) when an access terminal (AT) moves from the source AN to another access network (target AN) having a different capability in a high rate packet data system, the method comprising the steps of: receiving and storing non-default parameters that the AT can support, during initial session negotiation with the AT; and transmitting the stored information to the target AN when the AT moves to the target AN and requires its session from the target AN.

6. The method of claim 5 , wherein the stored information includes protocol types, the number of protocol subtypes, and protocol subtypes.

7. A method for triggering session re-negotiation in a target access network (AN) when an access terminal (AT) moves from a source AN to another access network (the target AN) having a different capability in a high rate packet data system, the method comprising the steps of: upon receiving a UATI Request message from the AT, acquiring an address of the source AN from the UATI and sending a session transmission request to the source AN; checking whether there is a need for session re-negotiation with the AT based on information received from the source AN, and if there is a need for the session re-negotiation, starting the session re-negotiation including protocol types; and continuing to use the re-negotiated protocol types.

8. The method of claim 7 , wherein the information received from the source AN includes protocol types, the number of protocol subtypes, and protocol subtypes.

9. The method of claim 7 , wherein the step of checking whether there is a need for session re-negotiation comprises the step of checking whether the target AN can support enhanced protocol subtypes from the ones currently in use.

10. A method for triggering session re-negotiation in a target access network (AN) when an access terminal (AT) moves from a source AN to another access network (the target AN) having a different capability in a high rate packet data system, the method comprising the steps of: broadcasting information related to minimum and maximum revisions that the target AN supports in overhead information messages including a sector parameter message; and upon receiving a session re-negotiation request from the AT, performing the session re-negotiation and continuing to use the re-negotiated protocol subtypes, protocols and applications.

11. An apparatus for triggering session re-negotiation in an access terminal (AT) when the AT moves from one access network (source AN) to another access network (target AN) having a different capability in a high rate packet data system, the apparatus comprising: a radio frequency (RF) transceiver for performing session negotiation and data exchange; a memory for storing information on parameters that the AT can support, and negotiated session information; and a controller for, upon detecting the target AN, sending a UATI Request message to the target AN through the RF transceiver, and upon receiving a session re-negotiation request from the target AN, performing session re-negotiation with the target AN and storing the re-negotiated session.

12. An apparatus for triggering session re-negotiation in a source access network (AN) when an access terminal (AT) moves from the source AN to another access network (target AN) having a different capability in a high rate packet data system, the apparatus comprising: a database for receiving and storing non-default parameters that the AT can support, together with information on a session negotiated during initial session negotiation with the AT; an interface for performing communication with the target AN; a radio frequency (RF) transceiver for performing communication with the AT; and a controller for transmitting all the stored information to the target AN when the AT moves to the target AN and requires its session from the target AN.

13. An apparatus for triggering session re-negotiation in a target access network (AN) when an access terminal (AT) moves from a source AN to another access network (the target AN) having a different capability in a high rate packet data system, the apparatus comprising: a radio frequency (RF) transceiver for performing communication with the AT; an interface for performing communication with the source AN; a database for storing session negotiation information for the AT; and a controller for, upon receiving a UATI Request message from the AT, acquiring an address of the Source AN from the UATI, sending a session transmission request to the source AN, checking whether there is a need for session re-negotiation with the AT based on information received from the source AN, and there is a need for the session re-negotiation, controlling the session re-negotiation using the RF transceiver.

14. A method for triggering session re-negotiation between an access terminal (AT) and an access network (AN) by the AT in a mobile communication system, the method comprising the steps of: transmitting, to the AN, a configuration request message including protocol types that the AT can support; receiving a response to the configuration request message from the AN that stored therein the protocol types included in the configuration request message; and performing communication through session negotiation with the AN.

15. The method of claim 14 , wherein the configuration request message further comprises protocol subtypes.

16. The method of claim 15 , wherein the configuration request message further comprises the number of protocol subtypes.

17. An apparatus for triggering session re-negotiation between an access terminal (AT) and an access network (AN) by the AT in a mobile communication system, the apparatus comprising the steps of: a radio frequency (RF) transceiver for transmitting, to the AN, a configuration request message including protocol types that the AT can support; a radio frequency (RF) receiver for receiving a response to the configuration request message from the AN that stored therein the protocol types included in the configuration request message; and a controller for performing communication through session negotiation with the AN.